Air diffuser



Patented Nov. 11, 1952 AIR DIFFUSEB Wilfred J. J. Fritz, Seattle, Wash.,assigner to Iron Fireman Manufacturing Company, Cleveland, OhioApplication February 3, 1950, Serial No. 142,122

3 Claims.

This invention relates generally to horizontal rotary cup type oilburners and more particularly to a means for shaping the llame of such aburner by controlling the primary air injection into the combustionchamber of such a burner. It is the principal object of this inventionto provide means which can be placed in the primary air stream of an oilburner to control the patternof primary air delivery to the combustionchamber of an oil burner and thereby control the flame pattern in thecombustion chamber.

It is a second object to provide such a means which can be manuallymanipulated to vary its form and therefor its effect on the ame pattern..It is a third object of this invention to provide a' unit made up of aseries of vanes which unit can be readily placed and held in the primaryair stream of an oil burner and which vanes can be independently bent orformed to obtain the desired iiame pattern in the combustion chamber ofthe oil burner.

It is a fourth obj ect to provide such a unit with vanes so shaped as tobe most adaptable to the purpose for which they areprovided.

This4 .application is acontinuation inpart of my previous application,S. N. 727,592, led February 10, 1947, on an Oil Burner, now PatentNumber 2,591,533. In Fig. l of the drawings of that application, oneform of the vane unit of this invention is shown in the primary airpassage just back of the rotary oil atomizing cup I and secured to theoil transfer fitting I4.

How the above stated objects of this invention are attained is shown inthe following specification and the attached drawing, in which:

Fig. 1 is an elevation in partial section of a rotary cup type oilburner.

Fig. 2 is a vertical section along the line 2-2 of Fig. 1 showing aspecific form of the air diffuser of this invention.

Fig. 3 is a developed View of the diffuser of Fig. 2 as it would look ifthe outside band were cut and laid out flat.

Fig. 4 is a perspective drawing of one of the vanes of the diffuser ofFig. 2.

Referring now to the drawing, Fig. 1 is a simplified showing of a rotarycup type oil burner partially sectioned to show one form of the aircontrol means of this invention. In Fig. 1 is shown an electric motor IIdriving a hollow shaft I2 through a V-belt and sheaves hidden by beltguard I3. Fuel oil from the pipe I4 traverses a small pipe inside thehollow shaft and leaves the pipe through a terminal fitting I5 insidethe rotary atomizing cup IB secured to rotating shaft I2.

inner surface of ring 28.

Primary combustion air fan II having blades I8 is carried on and securedto shaft I2 and rotates therewith. Primary air fan housing I9 is carriedon boiler front plate 20 through hinges (not shown) and in turn supportsburner frame casting 2I which carries motor II and in which shaft I2 isjournalled. Frame 2| has formed therein a primary air inlet passage 22through which primary air is led to the eye of fan I'I. Radial airdirecting ribs 23 are formed on the interior of fan housing I9 and carryliner 24 through screws '25. Primary air leaving fan blades I8 with acombined radial and rotary motion is directed by housing I9 to reverseits outward motion and return radially inward through the passagesformed between housing I9 and liner 24 by ribs 23. Liner 24 is shaped atits inner or air discharge end to direct the air axially outward throughthe extended axial discharge neck of housing I9 which terminates in aircone 26.

The vane ring of this invention, made up of ring 28 having manuallybendable vanes 29 secured thereto, is seen to be located within thedischarge neck of housing I9 and cone 26 where it is secured by. studs30. y

In the form shown, vanes 29 are each formed of sheet metal to have asupport element 3| by which it is secured, as by spot welding, to theRadial element 32 of vane 29 is formed at a right angle to support 3|and lies in a radial plane including the axial line of the rotary cup.Adjustable vane element 33 although it is part of the complete sheetmetal vane '29 is bendably adjustable with relation to radial element 32along their line of union 34. Also element 33 is bendable parallel toline 34 at any position along its length from line 34 to its tip 35.Also element 33 is manually warpable if that is found to be desirable inservice. The outer edge 36 of element 33 is curved for clearance withinair cone 26. From the above description it is seen that the primary airfor combustion will enter the burner through passage 22, will enter theeye of fan wheel II, traverse blades IB, reverse its direction inhousing I9, return radially through the ribbed passageway between liner24 and housing I9, change to an axial direction in the neck of housing I9, and be given any spin desired by vane ring 28 as it leaves air cone2B and enters the combustion chamber 31 to mix combustibly with theatomized oil leaving rotary cup I6.

Depending on experience with the particular combustion chamber used, theparticular rotary cup used, the particular air cone used, and the amountand type of oil being burned, the elements 33 of vanes 29 can be bent inthe field to dress the flame to give the best results for the particularinstallation. It should be noted that in certain circumstances it ispossible and will be desirable to vary the angularity of certain of theelements 33 with respect to their elements 32 differently from the.angularity of other of the elements'33 with respect to their elements32.

Having thus shown and described a specic construction and use of theprimary air controlling vane system of this invention in connection witha rotary cup type of oil burner and noting that another specificconstruction isV shown but not claimed in my -previous application, S.N. 727,592, I claim:

said'v whirling means comprising a vane ring and ai. .plurality ofVanes, said vane ring comprising a cylindrical body fitted to theinterior of the cylindrical portion of said conducting means adjacentthe conical extension thereof, each I- said vanesV comprising a radialsection and a wing section positionably secured to said radial sectionalong a radial edge thereof, said radial section being radially securedto said vane'ring along the'outer edge of said radial section, saidradial section being positioned with said outer edge parallel to theaxis of said conduit, and said wing section extending positionably intosaid conical endextension of saidiconduitV at an angle to saidradial'section.

l 2. A cylindricalv air conduit having an end extension inthe form of aright angled frustrated cone and means lor forcing air to 'ow throughsaid conduit andA outy through said conicalv ex,- tension thereof,together with means for whirling said air in said conical" extension ofsaid. conduit, said whirling means comprising a vane having a radialsection and a Wing section, said radial section of said vane being xedinteriorly of said cylindrical conduit in a plane including the axisthereof, said wing section of said vane being positionably secured tosaid radial section along an edge thereof radial of said conduit, andsaid, Wingl section of said Vane-extending into the conical extensionof'said conduit at' an angle to said radial section.

3. A cylindrical air conduit having an end extension in the form offrustrated cone and means for causing air to Vflow through said conduitand out through the conical end extension thereof.

' together with means for whirling said air passing out through saidextension, said whirling means comprising a plurality of vanes equallyspaced angularly about the axis of said conduit, eachV of said vaneshaving an upstream end section and a downstream end section, theupstream end. section of. one of. said vanesV being'A secured within theinteriorof saidI cylindrical section of said conduit in a planeincluding the axis' ofsaid conduit, the' downstream end sectionof"saidone of said Vanes being positionably secured to said upstreamsection along an edge thereof radial to said conduit, and' thedownstream end section of said;r one .of saidf vanes Vextending withinsaid conical` extension of said conduit at an angle tolth'eupstreanrend-section of said vane.

WILFRED' Ji. J. FRITZ.

REFERENCES. CITED.

The following referencesare of record" in. the le of! this patent:

y UNITED STATES PATENTS l Numberv

